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2 years ago

A collection of quarters and dimes is worth $12.40. There are 67 coins in all.

1 answer:

5 0

Let:
x= quarters
y= dimes

x+y=67
and
.25x+.10y=12.40

x=67-y

.25(67-y)+.10y=12.40
16.75-.25y+10y=12.40
16.75-.15y=12.40
Lets rearrange this:
-.15y+16.75=12.40
-16.75 -16.75
-.15y=-4.35
the negatives cancel out
.15y=4.35
.15 .15
y=29

Back to the original x=67-y
x=67-29
x=38

So,
x=38
y=29

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1 year ago

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2 years ago

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2 years ago

Whats the answer for 6n+7-2n-14=5n-1

12345 [234]

Answer:

Simplifying

6n + 7 + -2n + -14 = 5n + 1

Reorder the terms:

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Solving

-7 + 4n = 1 + 5n

Solving for variable 'n'.

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Add '-5n' to each side of the equation.

-7 + 4n + -5n = 1 + 5n + -5n

Combine like terms: 4n + -5n = -1n

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Step-by-step explanation:

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2 years ago

Read 2 more answers

Stephanie had seven add an 8 pound of bird seed she use three out of 8 pound to fill a bird feeder f Stephanie had 7 pound of bi

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So if I understand correctly, she had 7 1/8 pounds of birdseed and used 3/8 pound.
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3 years ago